代码之家 › 专栏 › 技术社区 › ryan

MVC2中的简单下拉列表?

asp.net-mvc-2 asp.net-mvc asp.net

2

ryan · 技术社区 · 15 年前

我有一个将真/假值存储为sqlserver位字段的表( Featured

第二,这是我到目前为止得到的有用但没有补充的东西 selected="selected" 到DDL中的任何项。

编辑1: 编辑2: 像函数一样使用它可以工作(有或没有强制转换),但是selected=“selected”仍然没有被添加。

//
// View models
public class SpotlightFormViewModel
{

    // props
    public Spotlight Spotlight { get; private set; }
    public SelectList FeaturedMenu { get; private set; }

    static IDictionary<string, int> feature = new Dictionary<string, int>(){
        {"True", 1},
        {"False", 0},
    };

    public IEnumerable<SelectListItem> FeaturedChoices(Spotlight spotlight)
    {
        return feature.Select(f => new SelectListItem
        {
            Text = f.Key,
            Value = f.Value.ToString(),
            Selected = spotlight.Featured,
        });
    }

    // constr
    public SpotlightFormViewModel(Spotlight spotlight)
    {
        Spotlight = spotlight;
        FeaturedMenu = new SelectList(FeaturedChoices(spotlight));
    }
}

控制器:

    public ActionResult Edit(int id)
    {
        Spotlight spotlight = spotlightRepository.GetSpotlight(id);

        return View(new SpotlightFormViewModel(spotlight));
    }

        <div class="editor-label">
            <%: Html.LabelFor(model => model.Spotlight.Featured) %>
        </div>
        <div class="editor-field">
            <%: Html.DropDownListFor(model => model.FeaturedMenu, Model.FeaturedChoices(Model.Spotlight))%>
            <%: Html.ValidationMessageFor(model => model.Spotlight.Featured) %>
        </div>

2 回复 | 直到 12 年前

1

3

Ted Gueniche 15 年前

我和你一样使用dropdowlist。但在你的情况下,你可以简单地使用一些单选按钮:

 <%: Html.Label("True") %>
 <%: Html.RadioButtonFor(model => model.FeaturedMenu, "1") %>

 <%: Html.Label("False") %>
 <%: Html.RadioButtonFor(model => model.FeaturedMenu, "0") %>

return feature.Select(f => new SelectListItem
{
    Text = f.Key,
    Value = f.Value.ToString(),
    Selected = false
});

2

1

ryan 15 年前

我终于成功了。即使我的语法;当我把变量传递给 public IEnumerable FeaturedChoices(Spotlight spotlight) 不管怎样,即使我明确地标记 Selected = true . 如果有人能回答为什么会这样我会很感激

唯一的办法 selected="selected" 如果我做了 FeaturedChoices

视图模型:

//
// View models
public class SpotlightFormViewModel
{

    // props
    public Spotlight Spotlight { get; private set; }
    public SelectList FeaturedMenu { get; private set; }

    static IDictionary<string, int> feature = new Dictionary<string, int>(){
        {"True", 1},
        {"False", 0},
    };

    public IEnumerable<SelectListItem> FeaturedChoices
    {
        get
        {                
            return feature.Select(f => new SelectListItem
            {
                Text = f.Key,
                Value = f.Value.ToString(),
                Selected = IsSelected(this.Spotlight.Featured, f.Key)
            });
        }
    }

    private bool IsSelected(bool featured, string val)
    {
        bool result = false;

        if (String.Compare(val, "True") == 0 && featured)
            result = true;
        else if (String.Compare(val, "False") == 0 && !featured)
            result = true;

        return result;
    }

    // constr
    public SpotlightFormViewModel(Spotlight spotlight)
    {
        Spotlight = spotlight;
    }
}

控制器:

    public ActionResult Edit(int id)
    {
        Spotlight spotlight = spotlightRepository.GetSpotlight(id);

        return View(new SpotlightFormViewModel(spotlight));
    }

查看:

        <div class="editor-label">
            <%: Html.LabelFor(model => model.Spotlight.Featured) %>
        </div>
        <div class="editor-field">
            <%: Html.DropDownListFor(model => model.FeaturedMenu, Model.FeaturedChoices)%>
            <%: Html.ValidationMessageFor(model => model.Spotlight.Featured) %>
        </div>